Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 28 May 2015, 21:16

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Rainy day

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Intern
Joined: 09 Apr 2003
Posts: 6
Followers: 1

Kudos [?]: 1 [0], given: 0

Rainy day [#permalink]  13 Apr 2003, 15:18
I saw this question on the GMAT club website. Not sure whether I solved this right.

The probability that it will rain in NYC on any given day in July is 30%. what is the probability that it will rain on exactly 3 days from July 5 to July 10 ?

6C3 * (0.3*0.3*0.3*0.7*0.7*0.7) = 0.18522
 Kaplan GMAT Prep Discount Codes Knewton GMAT Discount Codes GMAT Pill GMAT Discount Codes
Manager
Joined: 24 Jun 2003
Posts: 146
Location: India
Followers: 1

Kudos [?]: 1 [0], given: 0

Rainy day [#permalink]  26 Jun 2003, 07:56
ABNY

SVP
Joined: 03 Feb 2003
Posts: 1608
Followers: 6

Kudos [?]: 78 [0], given: 0

[#permalink]  27 Jun 2003, 00:05
The initial solution was mine
BB posted this question
Director
Joined: 03 Jul 2003
Posts: 655
Followers: 2

Kudos [?]: 28 [0], given: 0

[#permalink]  06 Jul 2003, 19:19
Why should the answer be multiplied with 6C3?
Why not just (0.3*0.3*0.3*0.7*0.7*0.7) ?
SVP
Joined: 03 Feb 2003
Posts: 1608
Followers: 6

Kudos [?]: 78 [0], given: 0

[#permalink]  06 Jul 2003, 22:19
The rainy days go in different order. We have to count all the combinations.
Manager
Joined: 25 Jun 2003
Posts: 95
Followers: 1

Kudos [?]: 0 [0], given: 0

[#permalink]  07 Jul 2003, 06:14
P(rainy day ) = 0.3
P(Shiny day ) = 1 - 0.3 = 0.7

If you apply Binomial Probablity Distribution, we get
P(of getting rain on 3 days out of 6 days) = 6C3 X (0.3)3 X (0.7)3

( where (0.3)3 = 0.3X0.3X0.3 )
_________________

Brainless

[#permalink] 07 Jul 2003, 06:14
Similar topics Replies Last post
Similar
Topics:
The strand fills with water during the rainy season that the 8 04 Jul 2008, 11:35
The strand fills with water during the rainy season that the 5 21 Jun 2008, 19:57
Whenever it is rainy, Janet goes to the mall. Therefore, it 9 25 Sep 2006, 10:18
The strand fills with water during the rainy season that the 14 01 Jul 2006, 02:21
Whenever it is rainy, Janet goes to the mall. Therefore, it 14 26 Jun 2006, 14:24
Display posts from previous: Sort by

# Rainy day

 Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.